- Cisco Employee,
We've had some discussion of 6.4 in other threads, and some of you may have received email notification, but I had neglected to post an announcement on IronPort Nation.
On October 6, 2008, we announced the general availability release of AsyncOS version 6.4.0-273 for all Email Security Appliances (C-Series and X-Series) and Security Management Appliances (M-Series).
Official Announcement on Support Portal
6.4.0 Email Security Release Notes
6.4.0 Security Management Release Notes
Email Security Product Support Engineer